Finding the Third Proportional to 56,409.75 and 123,889.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,409.75 : 123,889.50 = 123,889.50 : x
2. Step 2: Convert to fraction form
   56,409.75/123,889.50 = 123,889.50/x
3. Step 3: Cross multiply
   56,409.75x = 123,889.50 × 123,889.50
4. Step 4: Simplify right side
   56,409.75x = 15,348,608,210.25
5. Step 5: Solve for x
   x = 15,348,608,210.25/56,409.75
6. Step 6: Final answer
   x = 272,091.41